海域水文资料的不断丰富和声速仪的广泛使用，推动了水深声速改正精度的提高。
The accuracy of depth reduction has been improving with the continuous accumulation of hydrographic data and widely application of sound velocity profiler.
本文第一章介绍我们的超声波声速仪的原理和误差分析，并给出它和回呜法的比较。
In the first part of this paper, the principle and the error analysis of our ultrasonic velocimeter are presented, and a comparison with the "Sing Around velocimeter" is given.
采用声速仪及X射线衍射仪对不同牵伸倍数和不同预氧化程度的PAN纤维进行取向度和预氧化程度的测试，并将其结果进行对比。
PAN fibers with different drawing ratio and different preoxidation degree were investigated by means of sound velocimeter and X-ray diffraction meter.
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